Window regulator

2008 CADILLAC STS
90,000 MILES • 2.8L • V6 • 4WD • AUTOMATIC
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JENNIFER PERRY
  • MEMBER
  • 1 POST
Replaced a window regulator d/s and the window goes up but not down. How do I reverse the polarity?
Sep 2, 2018 at 6:45 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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HARRY P
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 2,292 POSTS
The switch should automatically reverse the polarity for you. If it is not doing that, then you probably need to replace the switch. You can disconnect the wires from the motor, and hook a multi-meter/voltmeter (set to 20 volts DC) and hit the switch. One way should show a positive 12 volts reading when you press the button, and the other should show a negative 12 volts reading when you press the button.

How to use a voltmeter: https://www.2carpros.com/articles/how-to-use-a-voltmeter
How to use a test light: https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
How to test wiring: https://www.2carpros.com/articles/how-to-check-wiring

Good luck and let us know what else we can do for you.
Sep 2, 2018 at 8:25 PM
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